Математика, 2005, ¹1 STRUCTURAL RESONANCES IN X-RAY SPECTRA OF RADIATION BY FAST CHARGES IN ELECTRON MATTER V. K. Grishin Skobeltsyn Institute of Atomic Physics of Lomonosov Moscow State University The practical possibility of observation of coherent polarizing bresstrahlung radiation (PB) by fast charges, arising at dispersion of own electromagnetic field of fast charges on atomic electrons in the condensed media, is considered. <...> PB effect of inhomogeneity of medium electron distribution, appearing due to intratomic bonds and resulting in produce of radiation intensity oscillation, is noted. <...> Main PB peak placed in low-frequency region has most intensity that corresponds to maximal coherency in radiation process. <...> Besides in PB spectrum there are additional peaks in which differences of photon phases are multiple . <...> Influence of structure ordering of media on characteristics of coherent peak PB is analyzed. <...> It is shown that medium structure regularity even low order results in sharp lowfrequency displacement of coherent peak, though its amplitude grows proportionally to a square of ordering length («effect of diffraction grating»). <...> Therefore possibility of its observation becomes rather problematic as here in low-frequency region there is also effect of coherent radiation suppression caused by self-suppressing of amplitudes of incident fast charge field. <...> In result, in the regular media first additional coherent peak grows sharply, that appropriates to condition of occurrence of PB kind Resonant transition radiation. <...> INTRODUCTION At present properties of fast charges radiation stimulated by theirs interaction with the atomic electrons in a condensed matter are lively discussed. <...> At first it is very important to research the inhomogeneity effect of electron density distribution in medium and its structural ordering. <...> It is known that electronic distributions in a media, despite of the broad variety, have one prominent feature. <...> Interatomic bonds in media are realized by electrons of external atomic shells, while internal electronic shells are practically not perturbed. <...> Because of that the electronic distributions of media represent alternations of more dense and practically empty zones of space which have regular or chaotic charac© Grishin V. K., 2005. ter depending on a degree of medium structure ordering <...>